Improved stitch



A. P. JOHNSON. LOCKED GHAN STITCH.

No. 26,906. Patented' Jan. 24, 1860.

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UNITED STATES PATENT OFFICE.

A. F. JOHNSON, OF BOSTON, ASSIGNOR TO ALFRED B. ELY, OF NEWTON,MASSACHUSETTS.

IMPROVED STITCH.

Specification forming part of Letters Paten-t No. 26,906, dated January24, 1860.

To am whom it may concern;

Be it-.kf'nown that l, A. F. JOHNSON, of Boston, in the county ofrSuffolk and State of Massachusetts, have invented a new and I1nprovedStitch for Sewing Cloth, Leather, Src., which I'terin a LockedChain-Stitch, and of which the following is a full, clear7 and exactdescription, reference being had to the accompanying drawings, makingpart of this specification, in which Figure l is a plan of the upper orright side;

Fig. :2, a plan ot the under side; Fig. 3, a side view.

The stitch which is formed by the combined operation of a needle andshuttle and known as the shuttle-stitch, while it possesses certainproperties of a perfectstitch, has. yet others which are objectionable,such as the ,non-elasticity ofthe stitchV in thin material, by which thethreadis rendered liable to be broken by a direct pull or strain uponthe cloth in the direction of the seam. A second objection to thisstitch for family use arises from the ditheulty of adjusting the tensionupon the two threads so that theyshall be equally drawn into the cloth,in consequence of which one or other of the threads is liable, upon thinniaterial, to lie straight along the seam, in which case it is easilybroken by a direct strain, and at each break of this thread severalstitches upon-each side of it are unraveled. :Thestitch known as thechain7 or i loop77 stitch is not liable to the objection ofnon-elasticity, and is consequently not so Veasily broken `by a directstrain as the former; but it is open to the .objection that it is easilyraveled out if the thread be drawn in a particular manner, as is alsothe double-looped stitch formed by the interlocking of'two threads andknown as the Grover is Baker stitch.

Hy invention hasl for its object to combine the desirable qualities ofbot-h the shuttlestitch and chain-stitch and to avoid the objections towhicheach of these is liable, and this I accomplish by means of niyimproved stitch, which consists of a chain-stitch, each loop of whichhas an auxiliary or locking thread passed through it.

To enable others skilled in the art to understand my invention, I willproceed to describe the manner in which I have carried it' out.

In the drawings, A is the cloth; f, the u p. per or needle thread,which. is formed into a series of chain-stitches, each loop of whichcarries a binding-thread, g, which is passed through it, and by which itis locked, so that it cannot be raveled or drawn out by pulling uponeither threadat any point.` 'The stitch shown in the accompanyingdrawings is formed by an ordinary chain-stitch needle and singlethread'and a revolvinghook, the operation of which is more fully setforth and described in an application for patent made simultaneouslywith this. When thus made the binding-thread .is passed around, under,and

through eachloop-of the chainfstitch seam, which is twistedhalf-round,as seen lin the drawings. This is the form of my stitch which I prefer,as the binding-thread, being wound partly round the loops of thechain-stitch, is'

also rendered elastic and not liable to be easilybroken. A. The stitchmay, however, be made by passing a shuttle with a bindingthreadthrougheach loop o f a chain-stitch, which latter may be made with auordinary needle and vibrating hook, or in any wellknown and suitablemanner; or the cha-institch may be formed in the customary man-i ner,and theA loops may be passed over the point of 'a stationary-shuttle; orthe bindingthread, in lieu of being passed through every loop of thechain-stitch, may be thrown through every second or third loop.

It is obvious that when the chain-stitch is made, as above described,with a reciprocating hook and a stationary or a reciprocating shuttle,the loops will not be twisted, as is the case where the revolving hookis used, and

the binding-thread will be straight along the seam without passing'around the loops, as before described. Vhen, however7 the stitch Vismade with a revolving hook it will have all the elasticity of theordinary chain-stitch, together with the properties of a fast or tightstitch, in a far greater degree than they are possessed by theshuttle-stitch, for should either one'oi the threads of the latter breakat any point, several stitches, both before and behina ie, winbedropped; but sheuld the bind- The Seinen herein aeseribed, eensisting efn ing-thread of theoeked ehainstiteh bebroken chain-stitch hzwing :nbindingllnfezul passed no stitches will be dropped unless the thread.throngh its' loops, -for the purpose described.

of the ehain-sti'ell be also broken at the sa-nle A. -F. JOHNSON.

point. Y Witnesses:

What I claim as my invention, and desire to SAM. COOPER,

secure by Letters Patent, is P. E. TESCHEMACIIER.

